KR20040022643A - Over cooling protecting system of refrigerator and controlling method thereof - Google Patents

Over cooling protecting system of refrigerator and controlling method thereof Download PDF

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Publication number
KR20040022643A
KR20040022643A KR1020020054255A KR20020054255A KR20040022643A KR 20040022643 A KR20040022643 A KR 20040022643A KR 1020020054255 A KR1020020054255 A KR 1020020054255A KR 20020054255 A KR20020054255 A KR 20020054255A KR 20040022643 A KR20040022643 A KR 20040022643A
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KR
South Korea
Prior art keywords
temperature
evaporator
refrigerator
compartment
defrost heater
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KR1020020054255A
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Korean (ko)
Inventor
김종기
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삼성전자주식회사
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Priority to KR1020020054255A priority Critical patent/KR20040022643A/en
Publication of KR20040022643A publication Critical patent/KR20040022643A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002Defroster control
    • F25D21/004Control mechanisms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06Removing frost
    • F25D21/08Removing frost by electric heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00Control issues
    • F25D2600/06Controlling according to a predetermined profile
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00Means for sensing or measuring; Sensors therefor
    • F25D2700/10Sensors measuring the temperature of the evaporator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00Means for sensing or measuring; Sensors therefor
    • F25D2700/12Sensors measuring the inside temperature

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Abstract

PURPOSE: A system and a method for preventing over cooling of a refrigerator are provided to prevent the over cooling of a refrigerating chamber when a refrigerator having no function to sense an atmospheric temperature is installed in a cold place. CONSTITUTION: A method for preventing over cooling of a refrigerator includes the steps of determining a natural defrosting state(S32), and measuring an internal temperature of a refrigerating chamber in the natural defrosting state(S34). A defrosting heater is turned on if the measured internal temperature is lower than a predetermined over cooling reference temperature(S36). If a temperature of an evaporator heated by the defrosting heater is higher than a predetermined temperature for resolving the over cooling, the defrosting heater is turned off(S38,S39).

Description

냉장고의 과냉방지시스템 및 과냉방지방법{OVER COOLING PROTECTING SYSTEM OF REFRIGERATOR AND CONTROLLING METHOD THEREOF}OVER COOLING PROTECTING SYSTEM OF REFRIGERATOR AND CONTROLLING METHOD THEREOF}

본 발명은 냉장고의 과냉방지시스템 및 과냉방지방법에 관한 것으로서, 보다 상세하게는, 외기온도의 감지기능이 없는 냉장고가 저온환경에 설치된 경우 냉장실이 과냉되는 것을 방지하는 냉장고의 과냉방지시스템 및 과냉방지방법에 관한 것이다.The present invention relates to a supercooling prevention system and a subcooling prevention method of a refrigerator, and more particularly, a subcooling prevention system and a subcooling prevention system of a refrigerator, which prevents the refrigerating compartment from being overcooled when a refrigerator without an outside temperature sensing function is installed in a low temperature environment. It is about a method.

음식물 등을 수용하여 냉각작동을 하는 냉장고는, 냉장고가 설치된 주변의 환경에 따라 냉각작동의 수행이 영향을 받게 된다. 특히, 겨울철에 실외나 방한이 잘 되지 않는 실내에서 사용할 경우와 같이 냉장고의 냉장실 내부온도보다 외기의 온도가 낮을 경우에는, 외기가 냉장실로 유입됨에 따라 과냉이 발생할 수가 있다. 냉장고는 사용자가 설정해 놓은 냉각강도를 유지하도록 작동하여야 하며, 이와 같은 상황에서는 불필요한 과냉에 의해 저장된 식품이 동결되는 등의 문제점이 발생할 수 있다.In a refrigerator that accommodates food and the like and performs a cooling operation, the performance of the cooling operation is affected by the surrounding environment in which the refrigerator is installed. In particular, when the temperature of the outside air is lower than the internal temperature of the refrigerator compartment, such as when used outdoors in winter or indoors where the cold weather is poor, overcooling may occur as the outside air flows into the refrigerator compartment. The refrigerator should operate to maintain the cooling strength set by the user, and in such a situation, problems such as freezing of food stored by unnecessary subcooling may occur.

이와 같은 문제점을 해결하기 위해, 외기온도를 감지하기 위한 외기온고감지센서를 따로 구비하여, 냉장고의 외기 온도가 낮은 경우, 냉장실이 과냉되는 것을 방지한 냉장고가 소개된 바 있다(한국특허등록 제10-0190125호).In order to solve such a problem, a refrigerator having a separate air temperature high temperature sensor for detecting the outside temperature is introduced to prevent the refrigerating compartment from being overcooled when the outside temperature of the refrigerator is low (Korean Patent Registration No. 10). -0190125).

그런데, 인용발명의 경우 외기온도를 감지하기 위한 외기온도감지센서를 따로 마련해야 하므로 생산비가 증가될 뿐 아니라, 이미 외기온도감지센서 구비되지 아니한 상태로 보급된 냉장고의 경우, 인용발명의 기술로는 냉장실의 과냉현상을 해결할 수 없다는 문제점이 있다.However, in the case of the cited invention, since the outside temperature sensor must be separately provided to detect the outside temperature, the production cost is increased, and in the case of the refrigerator which is already supplied without the outside temperature sensor, the refrigerator room is used as a technology of the cited invention. There is a problem that can not solve the supercooling phenomenon.

한편, 최근에는 냉장실의 냉각 효율을 높이기 위해서, 냉장고의 냉각 작동의수행이 완료된 후에도 송풍팬을 소정시간 동안 구동하여, 증발기에 남아있는 잔여냉기를 냉장실에 공급하도록 하고 있다. 냉각작동 수행 후의 송풍팬의 구동은 잔여냉기의 공급과 동시에 증발기에 생성된 성에를 제거하는, 소위 자연제상을 수행하는 역할을 겸한다. 이러한 자연제상을 수행하는 냉장고는, 제상히터에 의한 가열작동이 수행되는 주기가 자연제상을 수행하지 않는 냉장고에 비해 수배 정도 길어도 무방하므로, 가열에 의한 냉각효율 저하가 적고 냉각 효율이 높게 된다.On the other hand, in recent years, in order to increase the cooling efficiency of the refrigerating compartment, the blower fan is driven for a predetermined time even after the cooling operation of the refrigerator is completed to supply the remaining cold air remaining in the evaporator to the refrigerating compartment. The operation of the blower fan after performing the cooling operation also serves to perform so-called natural defrosting to remove the frost generated in the evaporator at the same time as supplying the remaining cold air. The refrigerator that performs the natural defrosting may be several times longer than the refrigerator in which the heating operation by the defrost heater is performed, compared to the refrigerator that does not perform the natural defrosting, so that the cooling efficiency decreases due to the heating and the cooling efficiency is high.

그런데, 특히 이러한 자연제상을 수행하는 냉장고는, 상기한 바와 같이 외기온도가 낮을 경우 이를 고려하지 않고 냉기의 공급이 계속되어 과냉의 우려가 높게 된다.By the way, in particular, the refrigerator that performs the natural defrosting, as described above, when the outside air temperature is low, the supply of cold air is continued without considering this, and there is a high risk of overcooling.

따라서, 본 발명의 목적은, 외기온도의 감지기능이 없는 냉장고가 저온환경에 설치된 경우 냉장실이 과냉되는 것을 방지하는 냉장고의 과냉방지시스템 및 과냉방지방법을 제공하는 것이다.Accordingly, it is an object of the present invention to provide an overcooling prevention system and an overcooling prevention method of a refrigerator that prevents a refrigerating compartment from being overcooled when a refrigerator having no sensing function of an outside temperature is installed in a low temperature environment.

도 1은, 냉장고의 개략적인 측단면도,1 is a schematic side cross-sectional view of a refrigerator,

도 2는, 본 발명에 따른 냉장고의 과냉방지시스템의 제어블럭도,2 is a control block diagram of an anti-cooling system of a refrigerator according to the present invention;

도 3은, 본 발명의 일 실시 예에 따른 냉장고의 과냉방지방법의 제어흐름도,3 is a control flow diagram of a method for preventing overcooling of a refrigerator according to one embodiment of the present invention;

도 4는, 본 발명의 다른 실시 예에 따른 냉장고의 과냉방지방법의 제어흐름도이다.4 is a control flowchart of a method for preventing undercooling of a refrigerator according to another embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

1:냉동실 3:냉장실1: freezer 3: refrigerator

5a:냉동실증발기 5b:냉장실증발기5a: freezer evaporator 5b: freezer evaporator

6a:냉동실팬 6b:냉장실팬6a: refrigerator compartment fan 6b: refrigerator compartment fan

9a:냉동실제상히터 9b:냉장실제상히터9a: Refrigerator chamber heater 9b: Refrigerator chamber heater

11a:냉동실증발기온도센서11b:냉장실증발기온도센서11a: freezer evaporator temperature sensor 11b: freezer evaporator temperature sensor

13:냉장실온도센서14:냉동실온도센서13: refrigerator temperature sensor 14: freezer temperature sensor

20 : 제어부20: control unit

상기 목적은, 본 발명에 따라, 냉매를 압축하는 압축기와, 상기 압축기로부터 냉매를 수령하여 냉기를 생성하는 증발기와, 상기 증발기에서 생성된 냉기를 송풍하는 송풍팬과, 상기 증발기의 제상을 위한 제상히터를 구비한 냉장고의 과냉방지방법에 있어서, 상기 압축기가 오프된 상태에서 상기 송풍팬 만으로 상기 증발기를 제상하는 자연제상상태인지 여부를 판단하는 단계와; 상기 자연제상상태인 것으로 판단된 경우, 상기 냉장실의 내부온도를 측정하는 단계와; 상기 냉장실의 내부온도가 소정의 과냉기준온도 이하인 것으로 판단된 경우, 상기 제상히터를 턴온시키는 단계와; 상기 제상히터로 인해 가열된 상기 증발기의 온도를 측정하는 단계와; 상기 증발기의 온도가 소정의 과냉해소온도 이상인 것으로 판단된 경우, 상기 제상히터를 턴오프시키는 단계를 포함하는 것을 특징으로 하는 냉장고의 과냉방지방법에 의해 달성된다.The object is, according to the present invention, a compressor for compressing a refrigerant, an evaporator for receiving coolant from the compressor to generate cold air, a blowing fan for blowing cold air generated in the evaporator, and a defrost for defrosting the evaporator. A method of preventing overcooling of a refrigerator having a heater, the method comprising: determining whether the compressor is in a natural defrost state in which the evaporator is defrosted by the blowing fan only; Measuring the internal temperature of the refrigerating compartment, when determined to be in the natural defrost state; Turning on the defrost heater when it is determined that an internal temperature of the refrigerating compartment is lower than a predetermined subcooling reference temperature; Measuring a temperature of the evaporator heated by the defrost heater; When it is determined that the temperature of the evaporator is more than a predetermined subcooling dissolution temperature, it is achieved by the method of preventing the subcooling of the refrigerator comprising the step of turning off the defrost heater.

여기서, 상기 제상히터가 턴온된 경우, 상기 송풍팬의 동작을 중지시키는 단계를 더 포함하여 냉장실 내부온도 온도측정의 오차를 감소시키는 것이 가장 바람직하다.Here, when the defrost heater is turned on, it is most preferable to further include the step of stopping the operation of the blowing fan to reduce the error of the temperature measurement inside the refrigerator compartment.

또한, 상기 제상히터에 의한 가열이 끝나고, 상기 제상히터가 턴오프된 경우, 상기 송풍팬을 동작시키는 단계를 더 포함하여 열기가 냉장실에 확산되도록 하는 것이 바람직하다.In addition, when the heating by the defrost heater is finished, when the defrost heater is turned off, it is preferable to further include the step of operating the blowing fan to allow the heat to diffuse in the refrigerating chamber.

한편, 상기 목적은 본 발명의 다른 분야에 따르면, 냉매를 압축하는 압축기와, 상기 압축기로부터 냉매를 수령하여 냉기를 생성하는 증발기와, 상기 증발기에서 생성된 냉기를 송풍하는 송풍팬과, 상기 증발기의 제상을 위한 제상히터를 구비한 냉장고의 과냉방지시스템에 있어서, 상기 냉장실의 내부온도를 측정하는 냉장실온도센서와; 상기 증발기의 온도를 측정하는 증발기온도센서와; 상기 압축기가 오프된 상태에서, 상기 송풍팬이 동작하는 자연제상 상태인 경우, 상기 냉장실온도센서를 통해 감지된 상기 냉장실의 내부온도가 소정의 과냉기준온도 이하일 경우, 상기 제상히터를 구동시키는 한편, 상기 증발기온도센서를 통해 감지된 상기 증발기의 온도가 소정의 과냉해소온도 이상일 경우, 상기 제상히터의 구동을 정지시키는제어부를 포함하는 것을 특징으로 하는 냉장고의 과냉방지시스템에 의해서도 달성된다.According to another aspect of the present invention, an object of the present invention is to provide a compressor for compressing a refrigerant, an evaporator for receiving coolant from the compressor to generate cold air, a blower fan for blowing cold air generated by the evaporator, and An overcooling prevention system of a refrigerator having a defrost heater for defrosting, comprising: a refrigerating compartment temperature sensor for measuring an internal temperature of the refrigerating compartment; An evaporator temperature sensor for measuring a temperature of the evaporator; In the state where the compressor is turned off, when the blowing fan is in a natural defrost state, when the internal temperature of the refrigerating compartment detected by the refrigerating compartment temperature sensor is lower than a predetermined subcooling reference temperature, the defrost heater is driven. When the temperature of the evaporator detected by the evaporator temperature sensor is more than a predetermined subcooling dissolution temperature, it is also achieved by the supercooling prevention system of the refrigerator comprising a control unit for stopping the drive of the defrost heater.

이하에서는 첨부도면을 참조하여 본 발명에 대해 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1은 냉장고의 개략적인 측단면도이다. 냉장고는 상부에 형성된 냉동실(1)과 하부에 형성된 냉장실(3)을 가지고 있다. 냉장고의 후면 하부에는 압축기(4)가 설치되어 있고, 냉장고의 후면에는 압축기(4)로부터 압축된 냉매에 의해 냉기를 생성하는 냉동실증발기(5a) 및 냉장실증발기(5b)가 설치되어 있다. 각 증발기(5a, 5b) 부근에는 냉동실팬(6a) 및 냉장실팬(6b)이 설치되어 각 증발기(5a, 5b)로부터의 냉기를 각각 냉동실(1) 및 냉장실(3)로 송풍한다. 이 송풍된 냉기에 의해 냉동실(1) 및 냉장실(3)의 냉각작동이 이루어진다.1 is a schematic side cross-sectional view of a refrigerator. The refrigerator has a freezing compartment 1 formed at an upper portion and a refrigerating compartment 3 formed at a lower portion thereof. A compressor 4 is provided below the rear of the refrigerator, and a freezer compartment evaporator 5a and a refrigerator compartment evaporator 5b are provided at the rear of the refrigerator to generate cold air by the refrigerant compressed from the compressor 4. The freezer compartment fan 6a and the refrigerating compartment fan 6b are provided near each evaporator 5a, 5b, and blows cold air from each evaporator 5a, 5b to the freezer compartment 1 and the refrigerator compartment 3, respectively. Cooling operation of the freezing chamber 1 and the refrigerating chamber 3 is performed by this blown cold air.

각 증발기(5a, 5b)에 인접한 영역에는 제상히터(9a, 9b)가 설치되어 있다. 각 제상히터(9a, 9b)는 냉장고의 냉각작동이 수행되지 않는 휴지기동안 가열작동하여, 냉각작동 중에 각 증발기(5a, 5b)의 외표면에 생성되는 성에를 제거하는 역할을 한다.Defrost heaters 9a and 9b are provided in regions adjacent to the evaporators 5a and 5b. Each defrost heater 9a, 9b heats during the rest period when the cooling operation of the refrigerator is not performed, and serves to remove frost generated on the outer surface of each evaporator 5a, 5b during the cooling operation.

각 증발기(5a, 5b)의 인접영역에는 각 증발기(5a, 5b)의 온도를 측정하기 위한 냉동실증발기온도센서(11a)와 냉장실증발기온도센서(11b)가 설치되어, 증발기(5)의 온도를 감지한다.In the adjacent areas of the evaporators 5a and 5b, a freezer evaporator temperature sensor 11a and a refrigerator compartment evaporator temperature sensor 11b for measuring the temperature of each evaporator 5a and 5b are provided to adjust the temperature of the evaporator 5. Detect.

냉동실(1) 내에는 냉동실(1) 냉부의 온도을 측정하는 냉동실온도센서(14)가 설치되어 있고, 냉장실(3) 내에는 냉장실(3) 내부의 온도를 측정하는 냉장실온도센서(13)가 설치되어 있다.The freezer compartment 1 is provided with a freezer compartment temperature sensor 14 for measuring the temperature of the freezer compartment 1, and the freezer compartment 3 has a refrigerator compartment temperature sensor 13 for measuring the temperature of the inside of the refrigerator compartment 3. It is.

도 2는 본 발명에 따른 냉장고의 과냉방지시스템의 제어블럭도이다. 도면에 도시된 바와 같이, 본 과냉방지시스템은, 냉장실(3) 내 온도를 감지하는 냉장실온도센서(13)와, 냉동실(1) 내 온도를 감지하는 냉동실온도센서(14)와, 증발기(5)의 온도를 감지하는 증발기온도센서(11)와, 냉동실팬(6a), 냉장실팬(6b), 제상히터(9) 및 압축기(4)와, 각 온도센서(11, 13, 14)를 통해 감지된 온도값에 따라 각각의 팬(6)과 제상히터(9) 및 압축기(4)를 제어하는 제어부(20)를 포함한다.2 is a control block diagram of an overcooling prevention system of a refrigerator according to the present invention. As shown in the figure, the present supercooling prevention system, the refrigerator compartment temperature sensor 13 for detecting the temperature in the refrigerator compartment 3, the freezer compartment temperature sensor 14 for detecting the temperature in the freezer compartment 1, and the evaporator 5 Through the evaporator temperature sensor 11, the freezer compartment fan 6a, the refrigerating compartment fan 6b, the defrost heater 9 and the compressor 4, and the respective temperature sensors 11, 13 and 14, which sense the temperature of And a control unit 20 for controlling each fan 6, the defrost heater 9, and the compressor 4 according to the sensed temperature value.

제어부(20)은 냉동실온도센서(14)로부터 측정된 냉동실(1)의 내부온도가 사용자가 기설정한 냉동실(1) 온도보다 높을 경우, 압축기(4)와 냉동실팬(6a) 및 냉장실팬(6b)을 구동하여 냉각작동을 수행한다.When the internal temperature of the freezer compartment 1 measured by the freezer compartment temperature sensor 14 is higher than the temperature of the freezer compartment 1 set by the user, the controller 20 may include the compressor 4, the freezer compartment fan 6a, and the refrigerating compartment fan ( Run 6b) to perform cooling operation.

이때, 냉동실팬(6a)은 압축기(4)가 구동되는 냉각작동 중 계속 구동되며, 냉장실팬(6b)은 냉장실온도센서(13)에서 측정된 냉장실(3) 내부온도가 미리 설정된 온도보다 높을 경우에만 구동되도록 제어된다. 이와 같은 냉각작동 수행 중, 냉동실온도센서(13)를 통해 감지한 냉동실(1)의 내부온도가 냉동실(1) 냉각강도에 해당하는 온도 이하가 되면, 제어부(20)는 압축기(4)의 구동을 멈추어 냉각작동을 종료한다.At this time, the freezer compartment fan 6a is continuously driven during the cooling operation in which the compressor 4 is driven, and the refrigerating compartment fan 6b has a temperature higher than the preset temperature of the refrigerating compartment 3 measured by the refrigerating compartment temperature sensor 13. Is controlled to be driven only. During the cooling operation, when the internal temperature of the freezer compartment 1 detected by the freezer compartment temperature sensor 13 becomes lower than or equal to the temperature corresponding to the freezing chamber 1 cooling intensity, the controller 20 drives the compressor 4. Stop the cooling operation.

냉각작동이 종료된 다음 소정시간 동안은 자연제상을 수행한다. 자연제상은 압축기(4)의 구동이 멈춘 다음에도 소정시간 동안 냉동실팬(6a)과 냉장실팬(6b)을 구동함으로써 행해진다. 자연제상에 의해, 압축기(4)의 구동이 멈춘 다음에도 냉동실증발기(5a)와 냉장실증발기(5b)에 남아있는 잔여냉기가 냉동실(1) 및 냉장실(3)에 공급되어 냉각 효율이 높아지게 된다. 또한, 제상히터(9a, 9b)를 작동시키지 않고도 어느 정도의 제상이 행해지게 된다.Natural defrosting is performed for a predetermined time after the cooling operation is completed. Natural defrosting is performed by driving the freezer compartment fan 6a and the refrigerating compartment fan 6b for a predetermined time even after the compressor 4 stops driving. Due to the natural defrosting, the remaining cold air remaining in the freezer compartment evaporator 5a and the refrigerator compartment evaporator 5b is supplied to the freezer compartment 1 and the refrigerator compartment 3 even after the operation of the compressor 4 is stopped, thereby increasing the cooling efficiency. In addition, some degree of defrosting is performed without operating the defrost heaters 9a and 9b.

한편, 제어부(20)는 자연제상이 시작되면, 냉장실온도센서를 통해 냉장실(3)내 온도를 감지하고, 이때 감지된 냉장실(3)의 온도가 소정 기준온도 이하로 측정된 경우 냉장실(3)의 제상히터(11b)를 구동시킨다.On the other hand, when the natural defrost is started, the control unit 20 detects the temperature in the refrigerating compartment 3 through the refrigerating compartment temperature sensor, and when the detected temperature of the refrigerating compartment 3 is measured below the predetermined reference temperature, the refrigerating compartment 3 To drive the defrost heater 11b.

즉, 제상히터(9a, 9b)를 작동시키지 아니하는 자연제상 운전 중일 경우, 냉장실(3)의 온도가 소정 기준온도 이하로 측정되면, 냉장실(3)이 과냉된 것으로 판단하여 냉장실제상히터(9b)를 구동시켜 냉장실(3) 내에 열기를 공급함으로써, 냉장실(3) 온도가 지나치게 낮아지는 것을 방지한다.That is, when the defrost heaters 9a and 9b are operating in the natural defrosting operation, when the temperature of the refrigerating chamber 3 is measured to be lower than or equal to the predetermined reference temperature, the refrigerating chamber 3 is determined to be supercooled and the refrigerating chamber defrost heater 9b. ) Is supplied to supply heat to the refrigerating chamber 3, thereby preventing the refrigerating chamber 3 temperature from becoming too low.

제어부(20)는 냉장실제상히터(9b)가 구동되기 시작하면, 제어부(20)는 냉장실제상히터(9b)의 인접영역에 설치된 냉장실증발기온도센서(11b)를 통해 냉장실증발기(5b)의 온도를 감지한다. 냉장실증발기온도센서(11b)를 통해 감지된 냉장실증발기(5b)의 온도가 소정 기준온도 이상일 경우, 제어부(20)는 냉장실제상히터(9b)를 턴오프 시킨다.When the control unit 20 starts to operate the refrigerating chamber defrost heater 9b, the control unit 20 uses the temperature of the refrigerating chamber evaporator 5b through the refrigerating chamber evaporator temperature sensor 11b installed in an adjacent region of the refrigerating chamber defrost heater 9b. Detect. When the temperature of the refrigerator compartment evaporator 5b sensed by the refrigerator compartment evaporator temperature sensor 11b is greater than or equal to a predetermined reference temperature, the controller 20 turns off the refrigerator compartment defrost heater 9b.

이와 같이, 냉장실제상히터(9b)와 가장 근접해 있는 냉장실증발기(5b)의 온도에 기초하여 냉장실제상히터(9b)의 구동을 제어함으로써, 냉장실온도센서(13)를 통해 냉장실(3) 내의 온도를 측정하는 것 보다 훨씬 작은 오차의 제어를 수행할 수 있다. 즉, 냉장실온도센서(13)를 통해 냉장실(3)의 고내 온도를 측정하는 경우, 냉장실온도센서(13)를 통해 고내 온도의 상승을 감지하기 까지 열기가 대류 하는데 걸리는 시간 등으로 인해 제어 상 오차가 커질 수 있다. 따라서, 냉장실제상히터(9b)와 가장 근접해 있는 냉장실증발기(5b)의 온도를 이용하여 냉장실제상히터(9b)의 구동을 제어하며, 정확한 냉장실증발기(5b) 온도의 측정을 위해 냉장실팬(6b)의 구동 또한, 오프시키는 것이 가장 바람직하다.Thus, by controlling the drive of the refrigerator compartment defrost heater 9b based on the temperature of the refrigerator compartment evaporator 5b which is closest to the refrigerator compartment defrost heater 9b, the temperature in the refrigerator compartment 3 is controlled through the refrigerator compartment temperature sensor 13. Much smaller control of the error can be achieved than measuring. That is, when measuring the temperature in the refrigerator compartment 3 through the refrigerator temperature sensor 13, the control phase error due to the time it takes for the heat to convex to detect the rise in the temperature through the refrigerator compartment temperature sensor 13, etc. Can be increased. Therefore, the driving of the refrigerator compartment defrost heater 9b is controlled by using the temperature of the refrigerator compartment evaporator 5b that is closest to the refrigerator compartment defrost heater 9b, and the refrigerator compartment fan 6b for accurate measurement of the refrigerator compartment evaporator 5b temperature. It is also most preferable to turn off the driving of.

한편, 자연제상 수행 시, 냉장실온도센서를 통해 감지된 냉장실(3)의 온도가 소정 기준온도 이하가 아닌 것으로 측정된 경우, 제어부(20)는 냉장실팬(6b)을 구동하여 정상적으로 자연제상을 수행한다.On the other hand, when performing natural defrosting, if the temperature of the refrigerating compartment 3 sensed by the refrigerating compartment temperature sensor is measured not to be below a predetermined reference temperature, the controller 20 drives the refrigerating compartment fan 6b to normally perform the natural defrosting. do.

이러한 구성을 갖는 본 발명에 따른 냉장고의 과냉방지시스템의 제어흐름도는 도 3에 도시된 바와 같다.Control flow chart of the supercooling prevention system of the refrigerator according to the present invention having such a configuration is as shown in FIG.

제어부(20)는 압축기(4)와 냉동실팬(6a) 및 냉장실팬(6b)을 구동하여 냉장고를 운전한다(S10). 제어부(20)는 압축기(4)가 오프되었는지 여부를 지속적으로 감지하며(S12), 압축기(4)가 오프 된 것으로 감지된 경우, 제어부(20)는 팬(6)이 동작중인지 여부를 확인한다(S14). 이상의 S12 및 S14 단계를 통해 제어부(20)는 자연제상이 수행중인지 여부를 확인할 수 있다.The controller 20 drives the compressor by driving the compressor 4, the freezer compartment fan 6a, and the refrigerating compartment fan 6b (S10). The controller 20 continuously detects whether the compressor 4 is turned off (S12), and when it is detected that the compressor 4 is turned off, the controller 20 checks whether the fan 6 is operating. (S14). Through the above steps S12 and S14, the control unit 20 can determine whether or not the natural defrosting is being performed.

제어부(20)의 확인결과 팬(6)이 동작중인 것으로 판단된 경우, 제어부(20)는 냉장실온도센서(13)를 통해 냉장실(3) 감지하여 냉장실(3) 온도가 소정 기준온도 이하인지 여부를 판단한다(S16).If it is determined that the fan 6 is operating, the control unit 20 detects the refrigerating compartment 3 through the refrigerating compartment temperature sensor 13 to determine whether the temperature of the refrigerating compartment 3 is lower than a predetermined reference temperature. Determine (S16).

제어부(20)의 판단결과, 냉장실(3)의 온도가 소정 기준온도 이하로 측정된 경우 제어부(20)는 냉장실제상히터(9b)를 턴온킨다(S18). 냉장실제상히터(9b)가 구동되기 시작하면, 제어부(20)는 냉장실제상히터(9b)의 인접영역에 설치된 냉장실증발기온도센서(11b)를 통해 감지된 냉장실증발기(5b)의 온도가 소정 기준온도 이상인지 여부를 판단한다(S20). 제어부(20)의 판단결과, 냉장실증발기(5b)의 온도가소정 기준온도 이상일 경우, 제어부(20)는 냉장실제상히터(9b)를 턴오프 시킨다(S22).As a result of the determination of the control unit 20, when the temperature of the refrigerating chamber 3 is measured to be equal to or less than a predetermined reference temperature, the control unit 20 turns on the refrigerating chamber actual heater 9b (S18). When the refrigerating chamber defrost heater 9b starts to be driven, the control unit 20 controls the temperature of the refrigerating chamber evaporator 5b detected by the refrigerating chamber evaporator temperature sensor 11b installed in an adjacent region of the refrigerating chamber defrost heater 9b. It is determined whether or not the abnormality (S20). As a result of the determination of the control unit 20, when the temperature of the refrigerator compartment evaporator 5b is equal to or higher than the predetermined reference temperature, the control unit 20 turns off the refrigerator compartment defrost heater 9b (S22).

한편, 제어부(20)의 판단결과, 냉장실(3)의 온도가 소정 기준온도 이하가 아닌 것으로 측정된 경우, 제어부(20)는 정상적인 제어를 수행한다(S24). 즉, 냉장실(3) 내 온도가 과냉상태가 아닌 것으로 판단된 경우, 제어부(20)는 냉장실팬(6b)을 구동하여 자연제상을 수행한다.On the other hand, when it is determined that the temperature of the refrigerating chamber 3 is not lower than or equal to a predetermined reference temperature, the controller 20 performs normal control (S24). That is, when it is determined that the temperature in the refrigerating compartment 3 is not an overcooling state, the controller 20 drives the refrigerating compartment fan 6b to perform natural defrosting.

도 4는 본 발명의 다른 실시 예에 따른 냉장고의 과냉방지방법의 제어흐름도이다.4 is a control flowchart of a method for preventing overcooling of a refrigerator according to another embodiment of the present invention.

제어부(20)는 압축기(4)와 냉동실팬(6a) 및 냉장실팬(6b)을 구동하여 냉장고의 냉각기능을 수행하며(S30), 냉장고의 상태가 자연제상 상태인지 여부를 지속적으로 확인한다(S32). 여기서, 제어부(20)는 압축기(4)가 오프된 상태에서 팬(6)이 동작하는 경우 자연제상 상태인 것으로 판단한다.The control unit 20 performs the cooling function of the refrigerator by driving the compressor 4, the freezer compartment 6a and the refrigerating compartment fan 6b (S30), and continuously checks whether the state of the refrigerator is a natural defrost state (S30). S32). Here, the control unit 20 determines that the natural defrost state when the fan 6 operates while the compressor 4 is turned off.

판단결과 자연제상 상태인 것으로 판단된 경우, 제어부(20)는 냉장실(3) 온도가 소정 기준온도 이하인지 여부를 판단한다(S34).If it is determined that the natural defrost state, the control unit 20 determines whether the temperature of the refrigerating chamber 3 is less than the predetermined reference temperature (S34).

여기서, 냉장실(3)의 온도가 소정 기준온도 이하가 아닌 것으로 측정된 경우, 제어부(20)는 자연제상을 수행하는 정상적인 제어를 수행한다(S35).Here, when it is determined that the temperature of the refrigerating chamber 3 is not lower than or equal to a predetermined reference temperature, the controller 20 performs normal control of performing natural defrosting (S35).

한편, 냉장실(3)의 온도가 소정 기준온도 이하로 판단되면 제어부(20)는 냉장실제상히터(9b)를 턴온시키는 한편, 냉장실팬(6b)의 동작을 정지시킨다(S36).On the other hand, when the temperature of the refrigerating chamber 3 is determined to be equal to or less than a predetermined reference temperature, the control unit 20 turns on the refrigerating chamber actual heater 9b and stops the operation of the refrigerating chamber fan 6b (S36).

냉장실제상히터(9b)가 구동되기 시작하면, 제어부(20)는 냉장실제상히터(9b)의 인접영역에 설치된 냉장실증발기온도센서(11b)를 통해 감지된 냉장실증발기(5b)의 온도가 소정 기준온도 이상인지 여부를 판단한다(S20).When the refrigerating chamber defrost heater 9b starts to be driven, the control unit 20 controls the temperature of the refrigerating chamber evaporator 5b detected by the refrigerating chamber evaporator temperature sensor 11b installed in an adjacent region of the refrigerating chamber defrost heater 9b. It is determined whether or not the abnormality (S20).

제어부(20)의 판단결과, 냉장실증발기(5b)의 온도가 소정 기준온도 이상일 경우, 제어부(20)는 냉장실제상히터(9b)를 턴오프 시킨다(S22).As a result of the determination of the controller 20, when the temperature of the refrigerator compartment evaporator 5b is equal to or higher than a predetermined reference temperature, the controller 20 turns off the refrigerator compartment defrost heater 9b (S22).

냉장실제상히터(9b)가 턴오프되면, 제어부(20)는 압축기(4)가 다시 턴온되어 냉각사이클이 시작될 때까지, 냉장실팬(6b)을 다시 구동시켜 자연제상을 수행한다(S40).When the refrigerator compartment defrost heater 9b is turned off, the controller 20 drives the refrigerator compartment fan 6b again to perform natural defrosting until the compressor 4 is turned on again to start a cooling cycle (S40).

이상 설명한 바와 같이, 본원발명은 외기온도가 낮을 경우 특히 과냉의 우려가 높은 자연제상을 수행하는 냉장고 중, 외기온도 감지기능이 없는 냉장고에 있어서, 설치환경의 저온조건에서 냉장실이 과냉되는 것을 방지할 수 있도록 하고 있다.As described above, the present invention is to prevent the refrigerating compartment from being overcooled under low temperature conditions of the installation environment in a refrigerator which does not have an outside temperature detection function among refrigerators which perform a natural defrosting, especially when the outside temperature is low, in which there is a high risk of overcooling. To make it possible.

이러한 본원발명에 냉장고에 구비되어 있는 냉장실온도센서, 증발기온도센서 및 제상히터를 이용하여 냉장실의 과냉을 방지하고 있으므로, 제어부에 본 발명의 과냉방지방법에 따른 프로그램을 입력하여 제상히터를 적절히 제어함으로서 구현하는 것도 가능하다.Since the refrigerator compartment temperature sensor, the evaporator temperature sensor, and the defrost heater are provided in the present invention to prevent overcooling of the refrigerating compartment, by inputting a program according to the method for preventing overcooling of the present invention to the controller, the defrost heater is properly controlled. It is also possible to implement.

이상 설명한 바와 같이, 본 발명에 따르면, 외기온도의 감지기능이 없는 냉장고가 저온환경에 설치된 경우 냉장실이 과냉되는 것을 방지하는 냉장고의 과냉방지시스템 및 과냉방지방법을 제공된다.As described above, according to the present invention, there is provided a subcooling prevention system and a subcooling prevention method of a refrigerator to prevent the refrigerating compartment from being overcooled when a refrigerator having no sensing function of an outside temperature is installed in a low temperature environment.

Claims (6)

냉매를 압축하는 압축기와, 상기 압축기로부터 냉매를 수령하여 냉기를 생성하는 증발기와, 상기 증발기에서 생성된 냉기를 송풍하는 송풍팬과, 상기 증발기의 제상을 위한 제상히터를 구비한 냉장고의 과냉방지방법에 있어서,A compressor for compressing a refrigerant, an evaporator for receiving coolant from the compressor to generate cold air, a blower fan for blowing cold air generated in the evaporator, and a defrost heater for defrosting the evaporator. To 상기 압축기가 오프된 상태에서 상기 송풍팬 만으로 상기 증발기를 제상하는 자연제상상태인지 여부를 판단하는 단계와;Determining whether the compressor is in a natural defrost state in which the evaporator is defrosted only by the blowing fan; 상기 자연제상상태인 것으로 판단된 경우, 상기 냉장실의 내부온도를 측정하는 단계와;Measuring the internal temperature of the refrigerating compartment, when determined to be in the natural defrost state; 상기 냉장실의 내부온도가 소정의 과냉기준온도 이하인 것으로 판단된 경우, 상기 제상히터를 턴온시키는 단계와;Turning on the defrost heater when it is determined that an internal temperature of the refrigerating compartment is lower than a predetermined subcooling reference temperature; 상기 제상히터로 인해 가열된 상기 증발기의 온도를 측정하는 단계와;Measuring a temperature of the evaporator heated by the defrost heater; 상기 증발기의 온도가 소정의 과냉해소온도 이상인 것으로 판단된 경우, 상기 제상히터를 턴오프시키는 단계를 포함하는 것을 특징으로 하는 냉장고의 과냉방지방법.And if the temperature of the evaporator is determined to be equal to or higher than a predetermined subcooling dissolution temperature, turning off the defrost heater. 제 1 항에 있어서,The method of claim 1, 상기 제상히터가 턴온된 경우, 상기 송풍팬의 동작을 중지시키는 단계를 더 포함하는 것을 특징으로 하는 냉장고의 과냉방지방법.And stopping the operation of the blowing fan when the defrost heater is turned on. 제 1 항에 있어서,The method of claim 1, 상기 제상히터가 턴오프된 경우, 상기 송풍팬을 동작시키는 단계를 더 포함하는 것을 특징으로 하는 냉장고의 과냉방지방법.And operating the blower fan when the defrost heater is turned off. 냉매를 압축하는 압축기와, 상기 압축기로부터 냉매를 수령하여 냉기를 생성하는 증발기와, 상기 증발기에서 생성된 냉기를 송풍하는 송풍팬과, 상기 증발기의 제상을 위한 제상히터를 구비한 냉장고의 과냉방지시스템에 있어서,Refrigerator prevention system having a compressor for compressing a refrigerant, an evaporator for receiving coolant from the compressor to generate cold air, a blowing fan for blowing cold air generated in the evaporator, and a defrost heater for defrosting the evaporator. To 상기 냉장실의 내부온도를 측정하는 냉장실온도센서와;A refrigerator compartment temperature sensor for measuring an internal temperature of the refrigerator compartment; 상기 증발기의 온도를 측정하는 증발기온도센서와;An evaporator temperature sensor for measuring a temperature of the evaporator; 상기 압축기가 오프된 상태에서 상기 송풍팬 만으로 상기 증발기를 제상하는 자연제상상태인 경우, 상기 냉장실온도센서를 통해 감지된 상기 냉장실의 내부온도가 소정의 과냉기준온도 이하일 경우, 상기 제상히터를 구동시키는 한편, 상기 증발기온도센서를 통해 감지된 상기 증발기의 온도가 소정의 과냉해소온도 이상일 경우, 상기 제상히터의 구동을 정지시키는 제어부를 포함하는 것을 특징으로 하는 냉장고의 과냉방지시스템.When the compressor is in a natural defrost state in which the evaporator is defrosted only by the blowing fan, when the internal temperature of the refrigerating compartment detected by the refrigerating compartment temperature sensor is lower than a predetermined subcooling reference temperature, driving the defrost heater. On the other hand, when the temperature of the evaporator detected by the evaporator temperature sensor is a subcooling prevention temperature, characterized in that it comprises a control unit for stopping the drive of the defrost heater. 제 4 항에 있어서,The method of claim 4, wherein 상기 제어부는 상기 제상히터가 턴온된 경우, 상기 송풍팬의 동작을 중지시키는 것을 특징으로 하는 냉장고의 과냉방지시스템.The control unit stops the cooling operation of the refrigerator, characterized in that to stop the operation of the blowing fan, when the defrost heater is turned on. 제 4 항에 있어서,The method of claim 4, wherein 상기 제어부는 상기 재생히터가 턴오프된 경우, 상기 소풍팬을 동작시키는 것을 특징으로 하는 냉장고의 과냉방지시스템.And the controller is configured to operate the picnic fan when the regenerative heater is turned off.
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KR19990034690A (en) * 1997-10-30 1999-05-15 윤종용 How to prevent overcooling of the refrigerator
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